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<p>In the present work, the dissimilar laser welding of thin sheets of pure commercial titanium with CoNiCrMo medium-entropy alloy, known as MP35N bio-alloy, has been studied. Due to the lack of proper jointing of these alloys followed by solidification cracks that arise from differences in physical and chemical properties, pure nickel and copper with different thicknesses were applied as the interlayer to investigate their impact on the weld microstructure and properties. Nickel and copper interlayers were found to prevent the formation of cracks mainly due to the ability to form the solid solution with titanium. The laser power and the scanning speed, as the main processing parameters, were considered as the variables in experiments to find the optimum welding conditions. The microstructure of the welded area and the corresponding mechanical properties have been characterized using optical microscopy, scanning electron microscopy, X-ray analysis, micro-hardness, and the tensile test. The experimental results convey that the volume of the melted zone and cooling rate, which are both affected by heat input and also the formation of intermetallic phases, all influence the hardness and shear load of the welded area. Compared with the copper interlayer, it was observed that the employing of nickel can be more influential in improving mechanical properties specially at partial penetration modes. The highest joint breaking force (691 N) at the optimized welding condition (2&#xa0;kW and 60&#xa0;mm/min) was accomplished by 100&#xa0;µm of nickel interlayer.</p>

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Dissimilar laser welding of Ti-CP4 to MP35N medium-entropy bio-alloy

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Habib Hamed Zargari,
  • Shayan Zand,
  • Mohammad Rezayat

摘要

In the present work, the dissimilar laser welding of thin sheets of pure commercial titanium with CoNiCrMo medium-entropy alloy, known as MP35N bio-alloy, has been studied. Due to the lack of proper jointing of these alloys followed by solidification cracks that arise from differences in physical and chemical properties, pure nickel and copper with different thicknesses were applied as the interlayer to investigate their impact on the weld microstructure and properties. Nickel and copper interlayers were found to prevent the formation of cracks mainly due to the ability to form the solid solution with titanium. The laser power and the scanning speed, as the main processing parameters, were considered as the variables in experiments to find the optimum welding conditions. The microstructure of the welded area and the corresponding mechanical properties have been characterized using optical microscopy, scanning electron microscopy, X-ray analysis, micro-hardness, and the tensile test. The experimental results convey that the volume of the melted zone and cooling rate, which are both affected by heat input and also the formation of intermetallic phases, all influence the hardness and shear load of the welded area. Compared with the copper interlayer, it was observed that the employing of nickel can be more influential in improving mechanical properties specially at partial penetration modes. The highest joint breaking force (691 N) at the optimized welding condition (2 kW and 60 mm/min) was accomplished by 100 µm of nickel interlayer.